CN112165847A - Microwave absorbing device based on magnetofluid self-assembly - Google Patents
Microwave absorbing device based on magnetofluid self-assembly Download PDFInfo
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- CN112165847A CN112165847A CN202011000380.0A CN202011000380A CN112165847A CN 112165847 A CN112165847 A CN 112165847A CN 202011000380 A CN202011000380 A CN 202011000380A CN 112165847 A CN112165847 A CN 112165847A
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- 238000001338 self-assembly Methods 0.000 title claims abstract description 17
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- 239000010408 film Substances 0.000 claims description 32
- 239000002245 particle Substances 0.000 claims description 27
- 239000010409 thin film Substances 0.000 claims description 19
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 7
- 239000004793 Polystyrene Substances 0.000 claims description 6
- 239000004005 microsphere Substances 0.000 claims description 6
- 229920002223 polystyrene Polymers 0.000 claims description 6
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 239000002048 multi walled nanotube Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000005642 Oleic acid Substances 0.000 claims description 2
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 4
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- 230000015572 biosynthetic process Effects 0.000 abstract description 3
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- 238000009826 distribution Methods 0.000 description 5
- 239000006249 magnetic particle Substances 0.000 description 5
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
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- 238000002059 diagnostic imaging Methods 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The embodiment of the invention discloses a microwave absorbing device based on magnetofluid self-assembly, which comprises a coil support, Helmholtz coils, a height platform, a magnetofluid film element and a film clamping base, wherein the Helmholtz coils consist of a pair of spiral coils with consistent parameters and are respectively oppositely and coaxially fixedly arranged on the coil support, the height platform is positioned at the central height of the Helmholtz coils, the magnetofluid film element is placed in a narrow groove of the film clamping base, and the magnetofluid film element is vertical to the Helmholtz coils. The invention has the advantages of good uniformity, strong magnetic response characteristic, simple synthesis and preparation process, excellent wave-absorbing performance, controllable and adjustable component adjustability and wave-absorbing performance and the like, and is suitable for the fields of daily electronic products, radars, precise medical instruments and the like.
Description
Technical Field
The invention relates to a microwave absorption device, in particular to a microwave absorption device based on magnetic fluid self-assembly.
Background
Microwave absorption is the conversion of microwave energy into energy in other forms of motion through some physical mechanism of action, and then into heat energy through the dissipative action of that motion. At present, microwave absorbing materials taking composite ferrite, organic high molecular polymers, silicon carbide fibers, carbon fibers and the like as absorbents are widely applied. A microwave absorbing device or element based on the magnetofluid self-assembly principle by taking the magnetofluid mixed solution as an absorbent is rarely reported. The development of novel magnetic wave-absorbing elements and materials with good wave-absorbing performance, wide absorption frequency band, abundant raw materials, easily mastered preparation process and low production cost is a key research point in the future.
In a microwave band of 3mm, the magnetic fluid can present dichroism under the action of an external magnetic field, if the external magnetic field is ensured to be parallel to the plane of the magnetic fluid film, when the microwave vertically enters the film, the microwave electric vector with the vibration direction parallel to the magnetic field direction can be obviously attenuated, and the attenuation degree is positively correlated with the magnetic field intensity of the applied magnetic field.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a microwave absorption device based on magnetofluid self-assembly. Can solve the problems of poor uniformity, complex synthesis and preparation process, weak magnetic response characteristic and the like of the existing microwave absorbing material.
The non-magnetic conductive particles are added into the magnetic fluid to form a magnetic fluid mixed solution, and the size of the micron-sized non-magnetic particles is far larger than that of the nanometer-sized magnetic particles in the magnetic fluid, so that the interaction between the non-magnetic particles and the magnetic fluid can be regarded as the fluid-solid coupling effect between solid-phase particles and Newtonian fluid. And applying a uniform magnetic field parallel to the direction of the film to the film coated with the magnetic fluid mixed solution, wherein the non-magnetic particles are reversely magnetized by the nearby magnetic fluid and show anisotropy, dipole force is generated among the non-magnetic particles due to magnetic moments, and the anisotropy enables the non-magnetic conductive particles to be self-assembled into a conductive chain in the direction parallel to the direction of the magnetic field. When microwaves penetrate the film perpendicular to the film, the electric vector of the microwaves with the vibration direction parallel to the magnetic field direction is absorbed in the film. This is mainly because: when the microwave is injected into the magnetic fluid film, the electric vector of the microwave parallel to the magnetic field direction generates an electric field, the direction of the electric field is the same as that of the electric vector, meanwhile, the conducting chain formed by self-assembly generates alternating current with the same frequency as that of the microwave in the magnetic field direction, the electromagnetic current can enable the microwave to dissipate energy, and when the microwave penetrates through the magnetic fluid film, the microwave becomes a state with small energy, namely a state with absorbed microwave.
In order to solve the above technical problems, an embodiment of the present invention provides a microwave absorbing device based on magnetofluid self-assembly, including a coil support, a helmholtz coil, a height stage, a magnetofluid thin film element, and a film clamping base, where the helmholtz coil is composed of a pair of spiral coils with the same parameters, and the spiral coils are respectively oppositely and coaxially and fixedly mounted on the coil support, the height stage is located at the central height of the helmholtz coil, the magnetofluid thin film element is placed in a narrow groove of the film clamping base, and the magnetofluid thin film element is perpendicular to the helmholtz coil.
Wherein, the distance between a pair of spiral coils is equal to the coil radius.
The magnetic fluid thin film element comprises two super-hydrophilic thin films and magnetic fluid mixed liquid coated at the centers of the two super-hydrophilic thin films.
The magnetic fluid mixed liquid is formed by mixing water-based magnetic fluid and non-magnetic conductive particles.
Wherein the mixed liquid of the magnetic fluid contains a surfactant.
Wherein the surfactant is oleic acid or a silane coupling agent.
The non-magnetic conductive particles comprise one of silver-plated polystyrene microspheres, copper-plated polystyrene microspheres, silver powder particles, copper powder particles and multi-wall carbon nanotube powder, and the particle size of the particles is micron-sized.
The embodiment of the invention has the following beneficial effects: the invention has the advantages of good uniformity, strong magnetic response characteristic, simple synthesis and preparation process, excellent wave-absorbing performance, component adjustability, controllable and adjustable wave-absorbing performance and the like, and is suitable for the fields of daily electronic products, radars, precise medical instruments and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a film holding base;
FIG. 3 is a schematic representation of microwaves being absorbed through the magnetic fluid thin film element;
FIG. 4 is a schematic illustration of a planar magnetic field distribution taken at one-half the height of a Helmholtz coil;
FIG. 5 is a schematic view of the distribution of particles within the magnetic fluid film when the coil is not carrying current;
FIG. 6 is a schematic diagram showing the distribution of particles in the magnetic fluid film when the coil carries currents in the same direction and magnitude.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the microwave absorbing device based on magnetofluid self-assembly of the present invention includes a coil support 1, a helmholtz coil 2, a half height stage 3, a magnetofluid thin film element 4, and a thin film clamping base 5.
As shown in fig. 2, a fixing hole 53 is formed in the middle of the film holding base, and the film holding base 5 can be fixed on the half height stage 3, which is located at the center height of the helmholtz coil, by means of a countersunk bolt. The magnetic fluid thin film element is vertical to the Helmholtz coil.
As shown in fig. 3, the helmholtz coil formed by a pair of spiral coils with consistent parameters is uniformly distributed on the intercepted plane magnetic induction line, that is, a uniform magnetic field with high uniformity is generated inside the coil.
And the pair of spiral coils with the same parameters are respectively oppositely and coaxially fixedly arranged on the coil bracket.
The magnetic fluid mixed liquid in the magnetic fluid thin film element 4 comprises non-magnetic conductive particles. The non-magnetic conductive particles comprise one of silver-plated polystyrene microspheres, copper-plated polystyrene microspheres, silver powder particles, copper powder particles and multi-wall carbon nanotube powder, and the particle size of the particles is micron.
The mode of operation of the invention is as follows:
s1 designing the coil support as shown in fig. 1; designing a half height platform as shown in figure 2, and determining the installation position of the height platform; the film holding base is designed to position its fixing holes 53 as shown in fig. 2.
S2 mounts two circular coils with the same parameters on the coil support 1, where h and R in fig. 1 are the distance between the centers of the two circular coils and the radius of the circular coil, respectively, and h = R must be ensured during mounting, so that the helmholtz coil 2 is assembled.
S3 preparing magnetic fluid mixed liquid, weighing quantitative non-magnetic conductive particles by an electronic balance, mixing the particles with magnetic fluid, adding a proper amount of surfactant, ultrasonically oscillating for 20 minutes to keep the uniform mixing state, and filling the mixed liquid into a reagent bottle for later use.
S4 two super-hydrophilic films with the thickness of 1mm are taken, a quantitative liquid injection pump is used for sucking a proper amount of the magnetic fluid mixed liquid prepared in S3 and dripping the magnetic fluid mixed liquid on one super-hydrophilic film, after the magnetic fluid mixed liquid is uniformly coated, the other super-hydrophilic film is horizontally laid, and the magnetic fluid film element 4 with a sandwich structure is formed.
S5 the base is fixed above the half-height table 3 by inserting a countersunk head bolt through the fixing hole 53 in the center of the film holding base 5.
S6, the magnetic fluid thin film element 4 prepared in S4 is placed in the narrow groove of the thin film clamping base 5, and the plane where the thin film element is located is ensured to be parallel to the plane where the circle center connecting line and the vertical radius connecting line of the coil are located.
S7, the components are assembled and assembled as shown in FIG. 1, and the distribution of particles in the magnetic fluid film is shown in FIG. 5 when the Helmholtz coil is not loaded with current; the particle distribution in the magnetic fluid film when the Helmholtz coils carry the same current in the same direction is shown in FIG. 6. A microwave oscillator can be arranged on one side of the magnetic fluid thin film element, and a receiver is arranged on the other side of the magnetic fluid thin film element, so that the microwave absorption performance of the device can be tested.
In the embodiment of the invention, the magnetic fluid film is used as a microwave absorption main element, then a uniform magnetic field in a specific direction is applied to the film, when the microwave penetrates through the film, the energy can be dissipated by the self-assembly in the magnetic fluid mixed solution, and meanwhile, the magnetic fluid can attenuate the microwave electric vector, so that the microwave absorption effect is achieved together. The magnetic fluid used in the invention has the characteristics of quick response of a magnetic field, good uniformity, good sealing property, adjustable components and the like, and the wave absorbing performance of the device can be adjusted by changing the intensity of the magnetic field in the Helmholtz coil. The element device has wide application prospect in the fields of radar, microwave medical instruments, bioseparation, medical imaging and the like, and can be even configured on electronic products such as televisions, audios, computers and the like, so that the electromagnetic microwave leakage is reduced to be below a safety limit value, and the health of a human body is ensured.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. The microwave absorption device based on the magnetofluid self-assembly is characterized by comprising a coil support, a Helmholtz coil, a height platform, a magnetofluid film element and a film clamping base, wherein the Helmholtz coil consists of a pair of spiral coils with the same parameters and is respectively oppositely and coaxially fixedly installed on the coil support, the height platform is positioned at the central height of the Helmholtz coil, the magnetofluid film element is placed in a narrow groove of the film clamping base, and the magnetofluid film element is perpendicular to the Helmholtz coil.
2. The magnetofluid self-assembly based microwave absorption device of claim 1 wherein the distance between a pair of the helical coils is equal to the coil radius thereof.
3. The microwave absorbing device based on the magnetic fluid self-assembly according to claim 2, wherein the magnetic fluid thin film element comprises two super-hydrophilic thin films and a magnetic fluid mixed solution coated in the center of the super-hydrophilic thin films.
4. The microwave absorbing device based on the magnetic fluid self-assembly according to the claim 3, wherein the magnetic fluid mixed solution is formed by mixing water-based magnetic fluid and non-magnetic conductive particles.
5. The microwave absorbing device based on magnetic fluid self-assembly according to claim 4, wherein the magnetic fluid mixed solution contains a surfactant.
6. The microwave absorbing device based on magnetic fluid self-assembly according to claim 5, wherein the surfactant is oleic acid or silane coupling agent.
7. The magnetofluid self-assembly based microwave absorption device according to claim 6, wherein the non-magnetic conductive particles comprise one of silver-plated polystyrene microspheres, copper-plated polystyrene microspheres, silver powder particles, copper powder particles and multi-wall carbon nanotube powder, and the particle size of the particles is in micron order.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011000380.0A CN112165847A (en) | 2020-09-22 | 2020-09-22 | Microwave absorbing device based on magnetofluid self-assembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011000380.0A CN112165847A (en) | 2020-09-22 | 2020-09-22 | Microwave absorbing device based on magnetofluid self-assembly |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4812767A (en) * | 1982-04-18 | 1989-03-14 | Susamu Taketomi | Optical apparatus using anomalously strong magneto-birefringence of magnetic fluid |
| CN1260904A (en) * | 1997-04-04 | 2000-07-19 | 振义·罗克斯·洪 | Ordered structure in homogeneous magnetic fluid thin films and method of preparation |
| CN102675668A (en) * | 2012-05-30 | 2012-09-19 | 电子科技大学 | Preparation method for nanoparticle magnetorheological elastomer thin film |
| CN106501636A (en) * | 2016-09-27 | 2017-03-15 | 汕头大学 | A kind of electric performance testing device of micro-nano granules magnetic assembling and its method of testing |
| CN106992416A (en) * | 2017-04-26 | 2017-07-28 | 汕头大学 | A kind of magnetic fluid miniature multipath rotary electric connector and its design method |
| CN107181150A (en) * | 2017-04-26 | 2017-09-19 | 汕头大学 | The miniature rotary electric connector of magnetic fluid and its design method with switching function |
| CN209055645U (en) * | 2018-10-16 | 2019-07-02 | 深圳市佳明高科磁铁制品有限公司 | A kind of magnetic element apparatus for measuring magnetic flux |
| CN110221093A (en) * | 2019-05-28 | 2019-09-10 | 南方科技大学 | A kind of immersion magnetic fluid rotation-speed measuring device and preparation method thereof |
| CN111564335A (en) * | 2020-06-08 | 2020-08-21 | 汕头大学 | Non-contact magnetic control switch based on self-assembly phenomenon of non-magnetic particles in magnetic fluid |
| CN111624533A (en) * | 2020-05-26 | 2020-09-04 | 中国人民解放军国防科技大学 | System and method for testing electric tuning characteristics of magnetic thin film by using TMR magnetic sensor |
-
2020
- 2020-09-22 CN CN202011000380.0A patent/CN112165847A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4812767A (en) * | 1982-04-18 | 1989-03-14 | Susamu Taketomi | Optical apparatus using anomalously strong magneto-birefringence of magnetic fluid |
| CN1260904A (en) * | 1997-04-04 | 2000-07-19 | 振义·罗克斯·洪 | Ordered structure in homogeneous magnetic fluid thin films and method of preparation |
| CN102675668A (en) * | 2012-05-30 | 2012-09-19 | 电子科技大学 | Preparation method for nanoparticle magnetorheological elastomer thin film |
| CN106501636A (en) * | 2016-09-27 | 2017-03-15 | 汕头大学 | A kind of electric performance testing device of micro-nano granules magnetic assembling and its method of testing |
| CN106992416A (en) * | 2017-04-26 | 2017-07-28 | 汕头大学 | A kind of magnetic fluid miniature multipath rotary electric connector and its design method |
| CN107181150A (en) * | 2017-04-26 | 2017-09-19 | 汕头大学 | The miniature rotary electric connector of magnetic fluid and its design method with switching function |
| CN209055645U (en) * | 2018-10-16 | 2019-07-02 | 深圳市佳明高科磁铁制品有限公司 | A kind of magnetic element apparatus for measuring magnetic flux |
| CN110221093A (en) * | 2019-05-28 | 2019-09-10 | 南方科技大学 | A kind of immersion magnetic fluid rotation-speed measuring device and preparation method thereof |
| CN111624533A (en) * | 2020-05-26 | 2020-09-04 | 中国人民解放军国防科技大学 | System and method for testing electric tuning characteristics of magnetic thin film by using TMR magnetic sensor |
| CN111564335A (en) * | 2020-06-08 | 2020-08-21 | 汕头大学 | Non-contact magnetic control switch based on self-assembly phenomenon of non-magnetic particles in magnetic fluid |
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| Title |
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Application publication date: 20210101 |